Long Island police are investigating a charge of sex harassment against another Suffolk cop – a detective accused of asking a woman he was interviewing to “show me your panties” in a detective squad room, sources said.

The woman came forward a few weeks ago, after another Suffolk cop, highway officer Frank Wright, was suspended amid allegations that he forced his victims to strip to avoid arrest for drunken driving.

The woman went to Gary Gramer, the lawyer for at least six women suing over allegations against Wright and other cops. Then she made her accusation to police against another cop, a 57-year-old detective.

She claimed the conversation last March at Suffolk’s 6th Precinct in Coram turned flirtatious while she was telling the detective about alleged harassment by her ex-husband.

He asked to see her underwear during an “inappropriate” conversation “of a sexual nature,” she said.

The detective, who is married and a father, is not identified.

The woman told investigators she refused the detective’s bizarre request to reveal her panties in the squad room, where several other people were present.

A law-enforcement source said the woman’s story is being “thoroughly investigated.”

Suffolk investigators have cast doubt on the stories of Wright forcing women to strip naked.